UNICEF announced on December 17, "Sooyoung, who has been consistently participating in various volunteer work, and Siwon, who has been a 'UNICEF' ambassador for the past two years, fit the image of santas who help children and were appointed as ambassadors for this campaign."

Sooyoung shared, "Although I am busy with my activities, I am joyful to use my talent for a really important cause. Because I am able to return the love I received to children, I participated with a joyful heart. Though all of you might be spending a busy holiday season, I hope that you will become santas who give big hope to the children in need in our neighboring countries right now with a bit of your help."

Siwon said, "After teaming up with UNICEF, every time I promote, I feel a sense of responsibility and duty... Please participate in the santa campaign and send a life-saving gift to the children who are in need of dire help."

Siwon and Sooyoung are known for their hearts of gold and continue to fight for a good cause as ambassadors for 'UNICEF'. The two idols were overseas, but they flew in to film the video for the campaign below!